TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 194 of 775

TM 9-2350-311-10

2–10 OPERATING PROCEDURES — CONTINUED

2-10.1 Starting Procedures-Continued

a. Starting Engine — Continued

10

11

12

13

NOTE

The combat override switch (M109A4/M109A5) is located on the back bulkhead of the hull

behind the section chief’s station.

If engine in M109A4/M109A5 vehicle does not start after four attempts, engage both STARTER control

switch (7) and combat override switch (10) as determined by the section chief. If engine still does not

start, notify unit maintenance.

If you notice a shrill whine, above normal turbine whine, rubbing, unusual vibrations, or a sudden

increase in exhaust smoke, shut off engine and notify unit maintenance.

With engine running, watch the ENGINE OIL PRESSURE gage (11). If engine oil pressure does not

register within 15 seconds (approximately 5 to 30 psi (34 to 207 kPa) at idle of 650 to 750 rpm),

immediately pull FUEL SHUTOFF control assembly handle (6) and stop engine. Notify unit maintenance.

Idle engine about two minutes. Adjust hand throttle control lever (8) and set to 1000 rpm (fast idle) on

tachometer (12). Warm-up engine until WATER TEMP gage (13) reaches 170° F.

During engine warm up, perform portable instrument panel (14) checkout procedure (para 2–10.2).

b. Starting Disabled Vehicle

1

For slave starting, notify unit maintenance.

2 For tow starting, see paragraph 2–10.5.

2-98